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Ultrasound induced lubricity in microscopic contact

Research output: Contribution to journalJournal article


<mark>Journal publication date</mark>1/09/1997
<mark>Journal</mark>Applied Physics Letters
Number of pages3
<mark>Original language</mark>English


A physical effect of ultrasound induced lubricity is reported. We studied the dynamic friction dependence on out-of-plane ultrasonic vibration of a sample using friction force microscopy and a scanning probe technique, the ultrasonic force microscope, which can probe the dynamics of the tip-sample elastic contact at a submicrosecond scale. The results show that friction vanishes when the tip-surface contact breaks for part of the out-of-plane vibration cycle. Moreover, the friction force reduces well before such a break, and this reduction does not depend on the normal load. This suggests the presence on the surface of a layer with viscoelastic behavior. (C) 1997 American Institute of Physics.